The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 1993
Filed:
May. 22, 1992
Applicant:
Inventors:
Yoshimitsu Terakado, Tokyo, JP;
Kazumasa Sasakura, Tokyo, JP;
Assignee:
Kabushiki Kaisha Shinkawa, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
219 5622 ; 219 5621 ; 21913031 ;
Abstract
In a method and apparatus for making uniform size balls at the end of bonding wires, a constant current circuit is installed between a high voltage power source and a discharge electrode so that a constant high voltage is applied between the bonding wire end and the discharge electrode and a discharge voltage is detected by a discharge voltage detecting circuit so that the thus detected discharge voltage is converted into a time so that a discharge time setting circuit which controls the constant current circuit regulates the discharge time period of the high voltage.